Allocate a bit more memory for MPC SV8 seek table, so bitreader won't read

beyond allocated block.

Originally committed as revision 19181 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpc8.c

@@ -97,7 +97,7 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
         av_log(s, AV_LOG_ERROR, "No seek table at given position\n");
         return;
     }
-    if(!(buf = av_malloc(size)))
+    if(!(buf = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE)))
         return;
     get_buffer(s->pb, buf, size);
     init_get_bits(&gb, buf, size * 8);